$mainSize:100px;
@function u($px) {
	@return $px/$mainSize*1rem;
}

@mixin transition($value) {
	-webkit-transition: $value;
	-moz-transition: $value;
	transition: $value;
}

@mixin animation($value) {
	-webkit-animation: $value;
	-moz-animation: $value;
	animation: $value;
}

@mixin boxShadow($normal) {
	box-shadow: $normal;
	-webkit-box-shadow: $normal;
	-moz-box-shadow: $normal;
}

@mixin transform($normal) {
	-webkit-transform: $normal;
	-moz-transform: $normal;
	transform: $normal;
}

@mixin u_radius($normal) {
	-moz-border-radius: $normal;
	-webkit-border-radius: $normal;
	border-radius: $normal;
}